Checking and setting
42
Spark plugs
The spark plugs should be renewed after
every 2000 hours operation.
Only the spark plugs specified under
”Technical Data” may be used.
Tightening torque:
with thread grease 22 Nm
without thread grease 27 Nm
(the use of any grease is not recom-
mended).
Installation of spark plugs in hot engine:
D Install spark plugs and tighten by hand
without a spanner
D Wait until spark plugs are at the tem-
perature of the engine (at least 2 min-
utes)
D Then tighten up with torque spanner
To check and adjust valve clear-
ance
(by authorized specialist personnel)
The valve clearance for new and over-
hauled engines should be checked after
the first 10 to 20 hours of operation.
The valve clearance (see ”Technical
Data”) should be adjusted so that the
feeler gauge can be moved between the
valves stem and the rocker arm with a
slight resistance being felt.
Adjustment is made with the adjusting
screw after releasing the lock nut.
Rotate the crankshaft so that the piston of
the cylinder to be adjusted is at firing
TDC. This is the case when the valves of
the synchronous pistons are just rocking.
Valve rocking on cylinder
112
5 8 3 10 6 7 2 11 4 9
6 7 2 11 4 9 1 12 5 8 3 10
Adjust valves on cylinder
To enable the engine to be cranked by
hand for adjustments there is a plate fitted
to the crankshaft V-belt pulley with a cen-
tral hexagon driver (barring device).
123
2012
1 Inlet valve
2 Exhaust valve
3 Feeler gauge
Cylinder head bolts
General notes
The engine may have either of the follow-
ing two types of cylinder head bolt:
D Cylinder head bolts with
hex head tightened by the
angle-of-rotation method,
socket size 19
D Cylinder head bolts with
Torx head tightened by the
angle-of-rotation method,
Torx wrench size E18
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